petraeus and his resignation >>> we've been following breaking news about david petraeus and his resignation as cia director and he's not the only one expected to leave the obama white house. here's a live shot of the white house as chuck todd reports, the president is also expected to replace several high-profile secretaries. in the video released by the obama campaign, a tearful president thanks his campaign workers. >> you guys, what you guys accomplished people will read about it and marvel about it, but the most important thing you need to know is that your journey is just beginning. >> reporter: now the president is getting ready for some big changes. this time to his cabinet. mr. obama's top three secretaries all expected to leave in the next few month, possibly before the end of the year. secretary clinton has repeatedly said she's on her way out. >> i want to then take some time to get reconnected to, you know, the stuff that makes life worth living. you know, family, friends, the sort of activities that i enjoy. >> reporter: the one-time rival to barack obama may be replaced by ano